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Title: Potential reactivity assessment of mechanically activated kaolin as alternative cement precursor
Author: Mañosa Bover, Jofre
Gómez-Carrera, A.M.
Svobodova Sedlackova, Adela
Maldonado Alameda, Alex
Fernández-Jiménez, A.
Chimenos Ribera, Josep Ma.
Keywords: Ciment
Materials de construcció
Building materials
Issue Date: 20-Jul-2022
Publisher: Elsevier B.V.
Abstract: This work aims to assess the potential reactivity of a mechanically activated kaolin for its use as an alternative cement precursor. The mechanical activation was successfully achieved by grinding at different rotation speeds (250, 300, and 350 rpm) and times (60, 90, and 120 min), obtaining a highly amorphous and reactive material. The amorphization was monitored through XRD with amorphous content estimation and FTIR deconvolution. The potential reactivity was evaluated through chemical attacks, obtaining SiO2 and Al2O3 availabilities up to 95 wt% and 93 wt% of total SiO2 and Al2O3 content. XRD and FTIR also allowed the identification of the nonreactive phases on the insoluble residue after chemical attacks. NMR analysis revealed that part of the aluminium was in IV coordination, limiting the reactivity in the alkali activation process. This work demonstrated the effectiveness of mechanical activation as a greener treatment than thermal dehydroxylation to increase the raw kaolin's reactivity.
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It is part of: Applied Clay Science, 2022, vol. 228, num. 106648
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ISSN: 0169-1317
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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